27 Cancri

27 Cancri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cancer
Right ascension 08h 26m 43.94035s[1]
Declination +12° 39′ 16.6066″[1]
Apparent magnitude (V) +5.56[2]
Characteristics
Evolutionary stage Asymptotic giant branch[3]
Spectral type M3 IIIa[4]
B−V color index 1.608±0.002[2]
Variable type SRb[3]
Astrometry
Radial velocity (Rv)−8.30±0.31[5] km/s
Proper motion (μ) RA: −19.760[1] mas/yr
Dec.: −104.664[1] mas/yr
Parallax (π)3.3094 ± 0.3176 mas[1]
Distance990 ± 90 ly
(300 ± 30 pc)
Absolute magnitude (MV)−1.62[2]
Details
Radius119[1] R☉
Luminosity2,455+707
−550[6] L☉
Surface gravity (log g)1.00[6] cgs
Temperature3,574[6] K
Metallicity [Fe/H]0.00[6] dex
Other designations
27 Cnc, BP Cancri, BD+13°1912, FK5 2658, GC 11525, HD 71250, HIP 41400, HR 3319, SAO 97819[7]
Database references
SIMBADdata

27 Cancri is a single[8] star in the zodiac constellation of Cancer, located around 990 light-years away from the Sun.[1] It is visible to the naked eye as a faint, red-hued star with a typical apparent visual magnitude of around +5.56.[2] The star is moving closer to the Earth with a heliocentric radial velocity of −8.3 km/s.[5] It is a member of the Arcturus stream, a group of stars with high proper motion and metal-poor properties thought to be the remnants of a small galaxy consumed by the Milky Way.[9]

This is an aging red giant with a stellar classification of M3 IIIa,[4] currently on the asymptotic giant branch.[3] It is classified as a semiregular variable star of type SRb and its brightness varies from magnitude +5.41 to +5.75 with a period of 40 days.[10] The star is radiating around 2,455[6] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,574 K.[6]

  1. ^ a b c d e f g Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Lebzelter2003 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference perkins1989 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  6. ^ a b c d e f Cite error: The named reference Maas2016 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference eggen71a was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Samus2017 was invoked but never defined (see the help page).